Key parameters at a glance
- A radius of 18.38 Earth radii
- A mass of 279.69 Earth masses
- Surface gravity around 0.83 g
- An orbital period of 3.378 days
- Semi-major axis 0.0478 AU
- Equilibrium temperature 1,823 K (1550 °C)
- Distance from Earth 2,524.36 light-years
- Earth Similarity Index 0.052
- Travel time at Voyager 1 speed 44,517,133 years
HATS-31 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#58of 1771
top 3.2%
This planet
18.38R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HATS-31 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 18.38 | 11.21 |
| Mass (M⊕) | 1.00 | 279.69 | 317.83 |
| Density (g/cm³) | 5.51 | 0.24 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.83 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,619.41 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 279.690 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 9385460
Gaia DR2
Gaia DR2 3498553232585634816
Gaia DR3
Gaia DR3 3498553232585634816
System
HATS-31
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.38 Earth days (0.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0478 AU.
Transit Fingerprint
Depth
0.720 %
Duration
4.594 h
Impact parameter b
0.480
Rp / R★
0.090800
Transit midpoint (BJD)
2,456,960.1476
Photometric dip
Transit produces a flux drop of 7,199 ppm lasting ≈ 4.59 h.
Extended Orbital Architecture
Planet / star radius ratio
0.090800
Semi-major axis / stellar radius
5.490
Impact parameter (b)
0.480
RV semi-amplitude (K)
102.000 m/s
Transit mid-time (BJD)
2,456,960.1476
Angular separation (arcsec)
0.06180
Eq. Temperature
1,823K
(1550 °C)
Insolation (S⊕)
1,619.41
Earth = 1.00
Earth Similarity (ESI)
0.052
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
De Val Borro et al. 2016Instrument
Apogee 4K CCD Sensor
Publication
2016-12
Observation locale
Ground
Discovery cohort
Planets confirmed in 2016 at HATSouth (12 shown).
Host System: HATS-31
Spectral Class
F-type yellow-white
Effective Temperature
6,050 K — hotter than the Sun (5,778 K)
Estimated Age
4.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.870 R☉
Stellar Mass
1.275 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
4.000 dex
Stellar density
0.275 g/cm³
Systemic radial velocity
-8.70 km/s
Rotational v·sin i
7.01 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
1.264 mas
Total Proper Motion
2.502 mas/yr
PM Right Ascension
-1.16 mas/yr
PM Declination
-2.22 mas/yr
Galactic Cartesian (pc)
x = -0.892 · y = -0.185 · z = -0.414
Equatorial (J2000)
RA 191.70282° · Dec -24.42739°
Galactic ℓ, b
301.588° · 38.432°
Ecliptic λ, β
200.530° · -17.816°
HTM-20 index
202114339
Similar Worlds
WASP-187 b
Gas Giant · F-type yellow-white
Radius 18.38 R⊕ · 1,211.4 ly
NGTS-33 b
Gas Giant · F-type yellow-white
Radius 18.38 R⊕ · 1,428.1 ly
K2-260 b
Gas Giant · F-type yellow-white
Radius 18.42 R⊕ · 2,165.1 ly
HAT-P-60 b
Gas Giant · F-type yellow-white
Radius 18.28 R⊕ · 760.7 ly
WASP-90 b
Gas Giant · F-type yellow-white
Radius 18.27 R⊕ · 1,521.3 ly
WASP-82 b
Gas Giant · F-type yellow-white
Radius 18.16 R⊕ · 899.1 ly